Pump



Dec. v118, w23.

- J. NL HOPWOOD AET AL PUMP Filed NOV. 19. 1921 2 Sheets-Sheet 2 NNIONV Patented Dec. 18, 19235.

JOHN IVI. HOPWOOD, OF DOBMON'VI, AND

SYLVANIA, ASSIGNOBS T0 GEORGE 3. HAGAN, TRUSTEE,

sYLvAivIri.

BRYANT BANNSTER, OF PITTSBURGH, 'PENN- PUMP.

Application filed November 19, 1921. SeralNo. 516,392.

To @ZZ whom it may camera:

Be it known that we, JOHN M. 4Horwoon and BRYANT BANNISTER, residing at Dormoiit and Pittsburgh, respectively, in the county ot Allegheny and State ot Pennsylvania7 citizens of the United States, have invented or discovered certain new and useful Improvements in Pumps, of which improvements the following is a specification.

The invention described herein relates to an improvement in pumps employed for eftecting a circulation of liquids as for eX- ample for causing the flow of water from a boiler through a filter or vother water treating device and back to the boiler; and the invention has for its object a construction wherein the liquid moving piston is shifted in one direction by the pressure of the liquid to be moved and in the opposite direction by the conjoint action of such pressure and the pressure of steam or other fluid under pressure. The invention is hereinafter more fully described and claimed.

In the accompanying drawings forming a part of this specification, Fig. 1 is a sectional elevation showing the improved pump operatively connected to a filter; Fig. 2 is an enlarged sectional view of the controlling valve; Fig. 3 is a sectional view on an enlarged scale of the valve mechanism controlling the admission of steam; Fig. 4 is a sectional detail of the lower end of the pump showing inlet and outlet ports and valve for the lower end of the pump; .Fig 4 is a plan View of the lower-head of the pump, and Fig. 5 is a sectional development of the lower head.

The pump consists ot a cylinder 1 in which is arranged the piston 2. The valves controlling the flow ot water to and from the cylinder are located in the head 3 secured to the lower end of the cylinder. Two of the valves, 4 and 5, control respectively the inlet and outlet tor the lower' end of the cylinder, while the inlet and outlet for the upper end of the cylinder are controlled by the. valves 6 and 7, said inlet and outlet. being connected by passages 8 and 9 to the upper end ot the cylinder. The inlets 4 and 6 are connected by passages 10 in the head to a port connected by apipe 11 to the discharge from the iilter or other treating apparatus and the outlet ports 5 and 7 are connected by passages 12 to a port which is connected by a pipe 13 to the boiler or other receptacle. y

The inlet to the iilter is connected tothe boiler and hence as the ilter will present Y ton minus the cross sectional area of thel v piston rod 14 which is preferably made of a diameter greater than necessary .for structural purposes, thus ensuring a greater di'lerential between effective pressures on opposite sides of the piston.

The piston rod 14 extends up in the cylinder 15 and is connected by the piston 16 located therein. This cylinder and piston are made ot such diameters that the pressure ot steam on its upper surface plus. the pressure ot water onrthel upper surface ot the pump piston .will be suflicient to overcomev the pressure on the underside ot the pump area and torce the'piston down. l Thev flow of steam to and trom the cylinder 15 is controlled by a valve 17 and a piston valve 18 connected by a stem 197 the seats 'for said valves being formed at the ends ot a bushing 2O secured in the valve chest 21 and connected `at a point intermediate its ends to the cylinder 15 by a port or passage 22. Steam is admitted to the valve chest through a port 23 located above the bushing. ln order to hold the inlet valve in open position and the piston or outlet valve 18 in closed position, a passage 24 is formed through the piston valve 18 permitting of theziow of steam from the chamber in the bushing to the chamber 25 below the piston valve. As the effec-- tive area of the lower end of the pistonris larger than that of the upper end the pressure ot steam in the chamber 25 will keep the exhaust valve closed and the inlet valve open. The shifting ot these valves to' permit of the flow of steam'to and from the cylinder is effected by the pump piston through a rod 26 which is connected at its upper end to the valves v and passes down through the pump piston. Tappets 27 aregzsecuredionithis rodgatsuchv points that ithe piston will* strike suchttappets' and shift the rod and valves as it approaches tilt-senditioiftisirliltijis Preferred te include resilient e1@- ment 2S in the valve rod 26 and to so set the tappets 27 that the resilient element will;

be placed under increasing tension as the pump piston approaches-the-limits of." its movements and that such tension Will becom'e suflicient to" overcome the' lockY pressure of the steam?.` on the valve, 17, or piston through' the valve-5 and'pipe 18 to the boilerand at thefsame time Water Will iioW fromlthe filter throughpipe 11 inlet valves 6 and '1passage`8` to thelupper-end of the cylinder. As steam flows through the bushing inv4 the' valve itvvill also ilovv through passage 24t`tothe-underside of the pistonvalve 18ithe'reby holding` such valve closedand the inlet-valve 17 "open until sufficient force is applied-by the pum-p piston-as it` approaches thieilovve'r-limitfof its movement to shiit the valves against the pressure of the steam, the exhaust valve to open position and the inlet valve to closedf position. As: soon as the steam pist'oniisv .relieved of pressure the pressure offfthe: Water acting on the lovver side ofthe-pump :pistonl Witl move ythe latter up. Thisupvvard movement vot thepump piston forces Water down through passage9 valve v 7 and'pipe.v 13-to .theiboiler and atsthe same time vvaterzvvill iiow from( theilter through pipe 11 .andk portl `into the lower end of the pump cylinder.. During .this upward movementfoffthev pumpipistonfthe steam inlet valverl7wand `thelexhaust onpiston valve 18 are heldin, closed and open positions lrespectively by: they pressure. of steanr on the inlet valve until ythe pump piston strikes `the upper. tappet.r and", reverses Vthe positions of these valves.

i It is characteristic Iof this improvement idescribed! hereinpthatthe features of both -a :singleacting.and a double acting pump are embodied, steam pressure being` employed A.for moving the! pump piston. in one -directionfandthe fluid operated onbeing employedifor movingl theipistonin the opposite direction. It is also characteristic oifthe improvement that the vaivemechamsm-controlling theioWoii steam to and from the power cylinder is shifted by the pump piston but is locked. inthepositions to Which it is shifted by steam pressure,

i further characteristic otwthe improvement is that all the pump valves are arranged in the lower head and readily accessible forreneival orqrepair, and if a duplicate be athand, the operationv of the pump need be discontinued only longenough to remove the oney head andsecure. the 'other in position.

"We claim herein as our invention:

'1. A pump having in combination a cylinder, valves controlling' the lovv loduid to and from said cylinder, a piston havingran area at one end or side substantially/'greater than that of the otherend Vor'side and :means '-f operating intermittently! in the same. direction as the pressure :act-ing on the end orn the piston having the smaller area tevovercome the pressure acting on the other.- side or end of thepiston.

2. Aipumphaving in: combination a cylinder, valves .controlling the `flow of Afluid to and from the saidcylinder, ay piston havi ing an area at one end or side substantially greater than that or the otherend or side and meanscontrolled by and operating 1ntermittently in theV same direction as the Y pressure acting onthe end ot the piston, having thesmaller -area to overcome the pressure acting on lthe other side or end of the piston..

v3. A pump having in: combination la cylinder, valves controlling. the floivof fluid to,` and frointhe cylinder, a ysecondigcylinder having its axis coincident With, the iirst cylinder, pistons having acommon, pistoni rod arranged yin said cylinders, the eective areay o1c :one side or end of the piston; inthe pump cylinder being greater than that ofthe other side or end, and a valve mechanism lll() controlling the iovv ot fluid Aunder pressure v te` one end of the second cylinder,I4

4. lA pump having incombination aE cylinder, valves controlling theiow oi Huid to and I from the cylinder, a secondcylinder having 'its axis coincidentivith; the first cylinder, pistons having acommonipiston .rod arranged ,in the cylinder, the effective area of one side or end ot the piston in the pump cylinder being greater than that oitv the other side or end, a valve mechanism controlling the flow oi' fluid under'pressure. to

one endroil theV secondfcylinder, Aand means operative by thel pistonin theiirst or pump cylinderfor shiftingV said val-ve mechanism.

5. A pump having in combination a cylinder, valves controllinglthe. flow of fluid tofand from the cylinder, a second ,cylinder having its axis coincident with lthe .first cylinder, pistons having a common piston rod arranged in the cylinder, the eHective area of one side or end of the piston in the pump cylinder being greater than that of the other side or end, a valve mechanism controlling the admission of fluid under pressure to the second cylinder, and adapted to be held in admission and exhaust positions by fluid under pressure, and means operative by the piston in the first or pump cylinder for shifting the valve mechanism against such fluid pressure.

6. A pump having in combination a cy",- inder, valves controlling the flow of fluid to and from the cylinder, a second cylinder having its axis coincident With the first cylinder, pistons having a common piston rod arranged in the cylinder, the effective area of one side or end of the piston in the pump cylinder being greater than that of the other side or end, a valve mechanism controlling the admission of fluid under 

